61501513 has 4 divisors (see below), whose sum is σ = 61756948. Its totient is φ = 61246080.

The previous prime is 61501507. The next prime is 61501519. The reversal of 61501513 is 31510516.

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

It is an interprime number because it is at equal distance from previous prime (61501507) and next prime (61501519).

It can be written as a sum of positive squares in 2 ways, for example, as 44262409 + 17239104 = 6653^2 + 4152^2 .

It is a cyclic number.

It is not a de Polignac number, because 61501513 - 2¹³ = 61493321 is a prime.

It is a super-2 number, since 2×61501513² = 7564872202578338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61501519) 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, 127356 + ... + 127837.

It is an arithmetic number, because the mean of its divisors is an integer number (15439237).

Almost surely, 2^61501513 is an apocalyptic number.

It is an amenable number.

61501513 is a deficient number, since it is larger than the sum of its proper divisors (255435).

61501513 is a wasteful number, since it uses less digits than its factorization.

61501513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255434.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 61501513 is about 7842.2900354425. The cubic root of 61501513 is about 394.7255755590.

The spelling of 61501513 in words is "sixty-one million, five hundred one thousand, five hundred thirteen".