61567951 has 4 divisors (see below), whose sum is σ = 61723432. Its totient is φ = 61412472.

The previous prime is 61567921. The next prime is 61567993. The reversal of 61567951 is 15976516.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61567951 - 2¹³ = 61559759 is a prime.

It is a super-2 number, since 2×61567951² = 7581225180676802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61567921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77145 + ... + 77938.

It is an arithmetic number, because the mean of its divisors is an integer number (15430858).

Almost surely, 2^61567951 is an apocalyptic number.

61567951 is a deficient number, since it is larger than the sum of its proper divisors (155481).

61567951 is a wasteful number, since it uses less digits than its factorization.

61567951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155480.

The product of its digits is 56700, while the sum is 40.

The square root of 61567951 is about 7846.5247721523. The cubic root of 61567951 is about 394.8676606283.

The spelling of 61567951 in words is "sixty-one million, five hundred sixty-seven thousand, nine hundred fifty-one".