61312811 has 8 divisors (see below), whose sum is σ = 71965920. Its totient is φ = 51133248.

The previous prime is 61312793. The next prime is 61312817. The reversal of 61312811 is 11821316.

61312811 = T₂₀₄ + T₂₀₅ + ... + T₇₂₁.

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 61312811 - 2¹⁰ = 61311787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61312817) 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, 118106 + ... + 118623.

It is an arithmetic number, because the mean of its divisors is an integer number (8995740).

Almost surely, 2^61312811 is an apocalyptic number.

61312811 is a deficient number, since it is larger than the sum of its proper divisors (10653109).

61312811 is a wasteful number, since it uses less digits than its factorization.

61312811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236773.

The product of its digits is 288, while the sum is 23.

The square root of 61312811 is about 7830.2497405894. The cubic root of 61312811 is about 394.3214564185.

The spelling of 61312811 in words is "sixty-one million, three hundred twelve thousand, eight hundred eleven".