61315309 has 32 divisors (see below), whose sum is σ = 73923840. Its totient is φ = 50265600.

The previous prime is 61315301. The next prime is 61315313. The reversal of 61315309 is 90351316.

It is not a de Polignac number, because 61315309 - 2³ = 61315301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61315301) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 447489 + ... + 447625.

It is an arithmetic number, because the mean of its divisors is an integer number (2310120).

Almost surely, 2^61315309 is an apocalyptic number.

It is an amenable number.

61315309 is a deficient number, since it is larger than the sum of its proper divisors (12608531).

61315309 is a wasteful number, since it uses less digits than its factorization.

61315309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 61315309 is about 7830.4092485642. The cubic root of 61315309 is about 394.3268114800.

The spelling of 61315309 in words is "sixty-one million, three hundred fifteen thousand, three hundred nine".