61213091 has 2 divisors, whose sum is σ = 61213092. Its totient is φ = 61213090.

The previous prime is 61213067. The next prime is 61213151. The reversal of 61213091 is 19031216.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61213091 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61213001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30606545 + 30606546.

It is an arithmetic number, because the mean of its divisors is an integer number (30606546).

Almost surely, 2^61213091 is an apocalyptic number.

61213091 is a deficient number, since it is larger than the sum of its proper divisors (1).

61213091 is an equidigital number, since it uses as much as digits as its factorization.

61213091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 61213091 is about 7823.8795363937. The cubic root of 61213091 is about 394.1075638019.

The spelling of 61213091 in words is "sixty-one million, two hundred thirteen thousand, ninety-one".