61091013 has 16 divisors (see below), whose sum is σ = 89997696. Its totient is φ = 36664320.

The previous prime is 61090973. The next prime is 61091039. The reversal of 61091013 is 31019016.

It is a happy number.

It is not a de Polignac number, because 61091013 - 2⁶ = 61090949 is a prime.

It is a super-2 number, since 2×61091013² = 7464223738732338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61091413) 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, 24868 + ... + 27213.

It is an arithmetic number, because the mean of its divisors is an integer number (5624856).

Almost surely, 2^61091013 is an apocalyptic number.

It is an amenable number.

61091013 is a deficient number, since it is larger than the sum of its proper divisors (28906683).

61091013 is a wasteful number, since it uses less digits than its factorization.

61091013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52124.

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 61091013 is about 7816.0740144909. The cubic root of 61091013 is about 393.8453983009.

The spelling of 61091013 in words is "sixty-one million, ninety-one thousand, thirteen".