61512813 has 12 divisors (see below), whose sum is σ = 89350560. Its totient is φ = 40778376.

The previous prime is 61512809. The next prime is 61512839. The reversal of 61512813 is 31821516.

It is not a de Polignac number, because 61512813 - 2² = 61512809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61512853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17481 + ... + 20702.

It is an arithmetic number, because the mean of its divisors is an integer number (7445880).

Almost surely, 2^61512813 is an apocalyptic number.

It is an amenable number.

61512813 is a deficient number, since it is larger than the sum of its proper divisors (27837747).

61512813 is a wasteful number, since it uses less digits than its factorization.

61512813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38368 (or 38365 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 61512813 is about 7843.0104551760. The cubic root of 61512813 is about 394.7497490881.

The spelling of 61512813 in words is "sixty-one million, five hundred twelve thousand, eight hundred thirteen".