61402713391 has 4 divisors (see below), whose sum is σ = 61458687792. Its totient is φ = 61346738992.

The previous prime is 61402713371. The next prime is 61402713413. The reversal of 61402713391 is 19331720416.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61402713391 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61402713391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61402713331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27985555 + ... + 27987748.

It is an arithmetic number, because the mean of its divisors is an integer number (15364671948).

Almost surely, 2^61402713391 is an apocalyptic number.

61402713391 is a deficient number, since it is larger than the sum of its proper divisors (55974401).

61402713391 is a wasteful number, since it uses less digits than its factorization.

61402713391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55974400.

The product of its (nonzero) digits is 27216, while the sum is 37.

The spelling of 61402713391 in words is "sixty-one billion, four hundred two million, seven hundred thirteen thousand, three hundred ninety-one".