61019591 has 2 divisors, whose sum is σ = 61019592. Its totient is φ = 61019590.

The previous prime is 61019587. The next prime is 61019597. The reversal of 61019591 is 19591016.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61019591 - 2² = 61019587 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61019597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30509795 + 30509796.

It is an arithmetic number, because the mean of its divisors is an integer number (30509796).

Almost surely, 2^61019591 is an apocalyptic number.

61019591 is a deficient number, since it is larger than the sum of its proper divisors (1).

61019591 is an equidigital number, since it uses as much as digits as its factorization.

61019591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2430, while the sum is 32.

The square root of 61019591 is about 7811.5037604804. The cubic root of 61019591 is about 393.6918558303.

The spelling of 61019591 in words is "sixty-one million, nineteen thousand, five hundred ninety-one".