245515531 has 2 divisors, whose sum is σ = 245515532. Its totient is φ = 245515530.

The previous prime is 245515507. The next prime is 245515553. The reversal of 245515531 is 135515542.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 245515531 - 2⁵ = 245515499 is a prime.

It is a super-2 number, since 2×245515531² = 120555751924423922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 245515493 and 245515502.

It is not a weakly prime, because it can be changed into another prime (245525531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122757765 + 122757766.

It is an arithmetic number, because the mean of its divisors is an integer number (122757766).

Almost surely, 2^245515531 is an apocalyptic number.

245515531 is a deficient number, since it is larger than the sum of its proper divisors (1).

245515531 is an equidigital number, since it uses as much as digits as its factorization.

245515531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15000, while the sum is 31.

The square root of 245515531 is about 15668.9352222798. The cubic root of 245515531 is about 626.1710575483.

The spelling of 245515531 in words is "two hundred forty-five million, five hundred fifteen thousand, five hundred thirty-one".