61115155 has 4 divisors (see below), whose sum is σ = 73338192. Its totient is φ = 48892120.

The previous prime is 61115137. The next prime is 61115161. The reversal of 61115155 is 55151116.

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

It is not a de Polignac number, because 61115155 - 2⁷ = 61115027 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6111511 + ... + 6111520.

It is an arithmetic number, because the mean of its divisors is an integer number (18334548).

Almost surely, 2^61115155 is an apocalyptic number.

61115155 is a deficient number, since it is larger than the sum of its proper divisors (12223037).

61115155 is a wasteful number, since it uses less digits than its factorization.

61115155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12223036.

The product of its digits is 750, while the sum is 25.

The square root of 61115155 is about 7817.6182434294. The cubic root of 61115155 is about 393.8972715248.

The spelling of 61115155 in words is "sixty-one million, one hundred fifteen thousand, one hundred fifty-five".