61157145 has 24 divisors (see below), whose sum is σ = 113828544. Its totient is φ = 27957216.

The previous prime is 61157119. The next prime is 61157147. The reversal of 61157145 is 54175116.

It is not a de Polignac number, because 61157145 - 2⁸ = 61156889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61157147) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40869 + ... + 42338.

It is an arithmetic number, because the mean of its divisors is an integer number (4742856).

Almost surely, 2^61157145 is an apocalyptic number.

It is an amenable number.

61157145 is a deficient number, since it is larger than the sum of its proper divisors (52671399).

61157145 is a wasteful number, since it uses less digits than its factorization.

61157145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83229 (or 83222 counting only the distinct ones).

The product of its digits is 4200, while the sum is 30.

The square root of 61157145 is about 7820.3033828618. The cubic root of 61157145 is about 393.9874617017.

The spelling of 61157145 in words is "sixty-one million, one hundred fifty-seven thousand, one hundred forty-five".