91121629 has 2 divisors, whose sum is σ = 91121630. Its totient is φ = 91121628.

The previous prime is 91121623. The next prime is 91121647. The reversal of 91121629 is 92612119.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79032100 + 12089529 = 8890^2 + 3477^2 .

It is a cyclic number.

It is not a de Polignac number, because 91121629 - 2³ = 91121621 is a prime.

It is a super-2 number, since 2×91121629² = 16606302543227282, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91121629.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91121621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45560814 + 45560815.

It is an arithmetic number, because the mean of its divisors is an integer number (45560815).

Almost surely, 2^91121629 is an apocalyptic number.

It is an amenable number.

91121629 is a deficient number, since it is larger than the sum of its proper divisors (1).

91121629 is an equidigital number, since it uses as much as digits as its factorization.

91121629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 31.

The square root of 91121629 is about 9545.7649772032. The cubic root of 91121629 is about 449.9944509604.

The spelling of 91121629 in words is "ninety-one million, one hundred twenty-one thousand, six hundred twenty-nine".