61312387 has 8 divisors (see below), whose sum is σ = 66020400. Its totient is φ = 56726784.

The previous prime is 61312379. The next prime is 61312399. The reversal of 61312387 is 78321316.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61312387 - 2³ = 61312379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61312357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29562 + ... + 31567.

It is an arithmetic number, because the mean of its divisors is an integer number (8252550).

Almost surely, 2^61312387 is an apocalyptic number.

61312387 is a deficient number, since it is larger than the sum of its proper divisors (4708013).

61312387 is a wasteful number, since it uses less digits than its factorization.

61312387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61205.

The product of its digits is 6048, while the sum is 31.

The square root of 61312387 is about 7830.2226660549. Note that the first 3 decimals coincide. The cubic root of 61312387 is about 394.3205474584.

The spelling of 61312387 in words is "sixty-one million, three hundred twelve thousand, three hundred eighty-seven".