121631519 has 2 divisors, whose sum is σ = 121631520. Its totient is φ = 121631518.

The previous prime is 121631513. The next prime is 121631527. The reversal of 121631519 is 915136121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121631519 is a prime.

It is a super-2 number, since 2×121631519² = 29588452828494722, which contains 22 as substring.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 121631491 and 121631500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121631513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60815759 + 60815760.

It is an arithmetic number, because the mean of its divisors is an integer number (60815760).

Almost surely, 2^121631519 is an apocalyptic number.

121631519 is a deficient number, since it is larger than the sum of its proper divisors (1).

121631519 is an equidigital number, since it uses as much as digits as its factorization.

121631519 is an evil number, because the sum of its binary digits is even.

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

The square root of 121631519 is about 11028.6680519453. The cubic root of 121631519 is about 495.4677332486.

The spelling of 121631519 in words is "one hundred twenty-one million, six hundred thirty-one thousand, five hundred nineteen".