36121391 has 2 divisors, whose sum is σ = 36121392. Its totient is φ = 36121390.

The previous prime is 36121367. The next prime is 36121399. The reversal of 36121391 is 19312163.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 36121391 - 2¹⁸ = 35859247 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 36121391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36121399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18060695 + 18060696.

It is an arithmetic number, because the mean of its divisors is an integer number (18060696).

Almost surely, 2^36121391 is an apocalyptic number.

36121391 is a deficient number, since it is larger than the sum of its proper divisors (1).

36121391 is an equidigital number, since it uses as much as digits as its factorization.

36121391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 26.

The square root of 36121391 is about 6010.1074033664. The cubic root of 36121391 is about 330.5634420839.

The spelling of 36121391 in words is "thirty-six million, one hundred twenty-one thousand, three hundred ninety-one".