61951559 has 2 divisors, whose sum is σ = 61951560. Its totient is φ = 61951558.

The previous prime is 61951543. The next prime is 61951577. The reversal of 61951559 is 95515916.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61951559 - 2⁴ = 61951543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61951529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30975779 + 30975780.

It is an arithmetic number, because the mean of its divisors is an integer number (30975780).

Almost surely, 2^61951559 is an apocalyptic number.

61951559 is a deficient number, since it is larger than the sum of its proper divisors (1).

61951559 is an equidigital number, since it uses as much as digits as its factorization.

61951559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60750, while the sum is 41.

The square root of 61951559 is about 7870.9312663750. The cubic root of 61951559 is about 395.6860565697.

The spelling of 61951559 in words is "sixty-one million, nine hundred fifty-one thousand, five hundred fifty-nine".