149017861 has 2 divisors, whose sum is σ = 149017862. Its totient is φ = 149017860.

The previous prime is 149017831. The next prime is 149017877. The reversal of 149017861 is 168710941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119793025 + 29224836 = 10945^2 + 5406^2 .

It is a cyclic number.

It is not a de Polignac number, because 149017861 - 2⁵ = 149017829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 149017861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149017811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74508930 + 74508931.

It is an arithmetic number, because the mean of its divisors is an integer number (74508931).

Almost surely, 2^149017861 is an apocalyptic number.

It is an amenable number.

149017861 is a deficient number, since it is larger than the sum of its proper divisors (1).

149017861 is an equidigital number, since it uses as much as digits as its factorization.

149017861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 149017861 is about 12207.2872088765. The cubic root of 149017861 is about 530.1671016943.

It can be divided in two parts, 149017 and 861, that added together give a triangular number (149878 = T₅₄₇).

The spelling of 149017861 in words is "one hundred forty-nine million, seventeen thousand, eight hundred sixty-one".