61031099 has 4 divisors (see below), whose sum is σ = 61055064. Its totient is φ = 61007136.

The previous prime is 61031053. The next prime is 61031101. The reversal of 61031099 is 99013016.

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 61031099 - 2⁸ = 61030843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61031599) 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, 7637 + ... + 13430.

It is an arithmetic number, because the mean of its divisors is an integer number (15263766).

Almost surely, 2^61031099 is an apocalyptic number.

61031099 is a deficient number, since it is larger than the sum of its proper divisors (23965).

61031099 is a wasteful number, since it uses less digits than its factorization.

61031099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23964.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 61031099 is about 7812.2403316846. The cubic root of 61031099 is about 393.7166037351.

The spelling of 61031099 in words is "sixty-one million, thirty-one thousand, ninety-nine".