61251919 has 2 divisors, whose sum is σ = 61251920. Its totient is φ = 61251918.

The previous prime is 61251917. The next prime is 61251947. The reversal of 61251919 is 91915216.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61251919 - 2¹ = 61251917 is a prime.

It is a super-2 number, since 2×61251919² = 7503595162365122, which contains 22 as substring.

Together with 61251917, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61251917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30625959 + 30625960.

It is an arithmetic number, because the mean of its divisors is an integer number (30625960).

Almost surely, 2^61251919 is an apocalyptic number.

61251919 is a deficient number, since it is larger than the sum of its proper divisors (1).

61251919 is an equidigital number, since it uses as much as digits as its factorization.

61251919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4860, while the sum is 34.

The square root of 61251919 is about 7826.3605207018. The cubic root of 61251919 is about 394.1908748164.

The spelling of 61251919 in words is "sixty-one million, two hundred fifty-one thousand, nine hundred nineteen".