61239797 has 8 divisors (see below), whose sum is σ = 65439000. Its totient is φ = 57106944.

The previous prime is 61239779. The next prime is 61239811. The reversal of 61239797 is 79793216.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4553956 + 56685841 = 2134^2 + 7529^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61239797 - 2¹⁰ = 61238773 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 (61239707) 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, 14672 + ... + 18377.

It is an arithmetic number, because the mean of its divisors is an integer number (8179875).

Almost surely, 2^61239797 is an apocalyptic number.

It is an amenable number.

61239797 is a deficient number, since it is larger than the sum of its proper divisors (4199203).

61239797 is a wasteful number, since it uses less digits than its factorization.

61239797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33175.

The product of its digits is 142884, while the sum is 44.

The square root of 61239797 is about 7825.5860483417. The cubic root of 61239797 is about 394.1648691167.

The spelling of 61239797 in words is "sixty-one million, two hundred thirty-nine thousand, seven hundred ninety-seven".