61397291 has 4 divisors (see below), whose sum is σ = 61417272. Its totient is φ = 61377312.

The previous prime is 61397269. The next prime is 61397311. The reversal of 61397291 is 19279316.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 61397291 - 2²² = 57202987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61397221) 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, 4301 + ... + 11886.

It is an arithmetic number, because the mean of its divisors is an integer number (15354318).

Almost surely, 2^61397291 is an apocalyptic number.

61397291 is a deficient number, since it is larger than the sum of its proper divisors (19981).

61397291 is a wasteful number, since it uses less digits than its factorization.

61397291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19980.

The product of its digits is 20412, while the sum is 38.

The square root of 61397291 is about 7835.6423476317. The cubic root of 61397291 is about 394.5024788834.

The spelling of 61397291 in words is "sixty-one million, three hundred ninety-seven thousand, two hundred ninety-one".