61115491 has 2 divisors, whose sum is σ = 61115492. Its totient is φ = 61115490.

The previous prime is 61115489. The next prime is 61115497. The reversal of 61115491 is 19451116.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61115491 - 2¹ = 61115489 is a prime.

Together with 61115489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (61115497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30557745 + 30557746.

It is an arithmetic number, because the mean of its divisors is an integer number (30557746).

Almost surely, 2^61115491 is an apocalyptic number.

61115491 is a deficient number, since it is larger than the sum of its proper divisors (1).

61115491 is an equidigital number, since it uses as much as digits as its factorization.

61115491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 28.

The square root of 61115491 is about 7817.6397333210. The cubic root of 61115491 is about 393.8979933820.

The spelling of 61115491 in words is "sixty-one million, one hundred fifteen thousand, four hundred ninety-one".