61891499 has 2 divisors, whose sum is σ = 61891500. Its totient is φ = 61891498.

The previous prime is 61891483. The next prime is 61891547. The reversal of 61891499 is 99419816.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61891499 - 2⁴ = 61891483 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61891429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30945749 + 30945750.

It is an arithmetic number, because the mean of its divisors is an integer number (30945750).

Almost surely, 2^61891499 is an apocalyptic number.

61891499 is a deficient number, since it is larger than the sum of its proper divisors (1).

61891499 is an equidigital number, since it uses as much as digits as its factorization.

61891499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 47.

The square root of 61891499 is about 7867.1150366573. The cubic root of 61891499 is about 395.5581470177.

The spelling of 61891499 in words is "sixty-one million, eight hundred ninety-one thousand, four hundred ninety-nine".