61155797 has 2 divisors, whose sum is σ = 61155798. Its totient is φ = 61155796.

The previous prime is 61155767. The next prime is 61155833. The reversal of 61155797 is 79755116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39262756 + 21893041 = 6266^2 + 4679^2 .

It is a cyclic number.

It is not a de Polignac number, because 61155797 - 2⁸ = 61155541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61155767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30577898 + 30577899.

It is an arithmetic number, because the mean of its divisors is an integer number (30577899).

Almost surely, 2^61155797 is an apocalyptic number.

It is an amenable number.

61155797 is a deficient number, since it is larger than the sum of its proper divisors (1).

61155797 is an equidigital number, since it uses as much as digits as its factorization.

61155797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 66150, while the sum is 41.

The square root of 61155797 is about 7820.2171964722. The cubic root of 61155797 is about 393.9845669786.

The spelling of 61155797 in words is "sixty-one million, one hundred fifty-five thousand, seven hundred ninety-seven".