61591265 has 16 divisors (see below), whose sum is σ = 78076416. Its totient is φ = 46569600.

The previous prime is 61591259. The next prime is 61591267. The reversal of 61591265 is 56219516.

61591265 = T₁₆₇₁ + T₁₆₇₂ + ... + T₁₇₁₃.

It is not a de Polignac number, because 61591265 - 2⁴ = 61591249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61591267) 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, 2045 + ... + 11285.

It is an arithmetic number, because the mean of its divisors is an integer number (4879776).

Almost surely, 2^61591265 is an apocalyptic number.

It is an amenable number.

61591265 is a deficient number, since it is larger than the sum of its proper divisors (16485151).

61591265 is a wasteful number, since it uses less digits than its factorization.

61591265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9320.

The product of its digits is 16200, while the sum is 35.

The square root of 61591265 is about 7848.0102573837. The cubic root of 61591265 is about 394.9174959875.

The spelling of 61591265 in words is "sixty-one million, five hundred ninety-one thousand, two hundred sixty-five".