61156091 has 2 divisors, whose sum is σ = 61156092. Its totient is φ = 61156090.

The previous prime is 61156049. The next prime is 61156093. The reversal of 61156091 is 19065116.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61156091 - 2⁶ = 61156027 is a prime.

Together with 61156093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61156093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30578045 + 30578046.

It is an arithmetic number, because the mean of its divisors is an integer number (30578046).

Almost surely, 2^61156091 is an apocalyptic number.

61156091 is a deficient number, since it is larger than the sum of its proper divisors (1).

61156091 is an equidigital number, since it uses as much as digits as its factorization.

61156091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 61156091 is about 7820.2359938815. The cubic root of 61156091 is about 393.9851983239.

The spelling of 61156091 in words is "sixty-one million, one hundred fifty-six thousand, ninety-one".