61312311 has 6 divisors (see below), whose sum is σ = 88562240. Its totient is φ = 40874868.

The previous prime is 61312309. The next prime is 61312313. The reversal of 61312311 is 11321316.

It is an interprime number because it is at equal distance from previous prime (61312309) and next prime (61312313).

It is not a de Polignac number, because 61312311 - 2¹ = 61312309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61312313) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3406231 + ... + 3406248.

Almost surely, 2^61312311 is an apocalyptic number.

61312311 is a deficient number, since it is larger than the sum of its proper divisors (27249929).

61312311 is a wasteful number, since it uses less digits than its factorization.

61312311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6812485 (or 6812482 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 61312311 is about 7830.2178130624. The cubic root of 61312311 is about 394.3203845312.

Adding to 61312311 its reverse (11321316), we get a palindrome (72633627).

The spelling of 61312311 in words is "sixty-one million, three hundred twelve thousand, three hundred eleven".