61399019 has 16 divisors (see below), whose sum is σ = 71215200. Its totient is φ = 52316160.

The previous prime is 61399007. The next prime is 61399031. The reversal of 61399019 is 91099316.

It is an interprime number because it is at equal distance from previous prime (61399007) and next prime (61399031).

It is a cyclic number.

It is not a de Polignac number, because 61399019 - 2¹⁶ = 61333483 is a prime.

It is a super-2 number, since 2×61399019² = 7539679068324722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61399049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58007 + ... + 59055.

It is an arithmetic number, because the mean of its divisors is an integer number (4450950).

Almost surely, 2^61399019 is an apocalyptic number.

61399019 is a deficient number, since it is larger than the sum of its proper divisors (9816181).

61399019 is a wasteful number, since it uses less digits than its factorization.

61399019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 61399019 is about 7835.7526122256. The cubic root of 61399019 is about 394.5061798821.

The spelling of 61399019 in words is "sixty-one million, three hundred ninety-nine thousand, nineteen".