61864519 has 2 divisors, whose sum is σ = 61864520. Its totient is φ = 61864518.

The previous prime is 61864493. The next prime is 61864541. The reversal of 61864519 is 91546816.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61864519 - 2⁹ = 61864007 is a prime.

It is a super-2 number, since 2×61864519² = 7654437422202722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61864559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30932259 + 30932260.

It is an arithmetic number, because the mean of its divisors is an integer number (30932260).

Almost surely, 2^61864519 is an apocalyptic number.

61864519 is a deficient number, since it is larger than the sum of its proper divisors (1).

61864519 is an equidigital number, since it uses as much as digits as its factorization.

61864519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 40.

The square root of 61864519 is about 7865.4001169680. The cubic root of 61864519 is about 395.5006608788.

The spelling of 61864519 in words is "sixty-one million, eight hundred sixty-four thousand, five hundred nineteen".