1242605631 has 4 divisors (see below), whose sum is σ = 1656807512. Its totient is φ = 828403752.

The previous prime is 1242605621. The next prime is 1242605641. The reversal of 1242605631 is 1365062421.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1242605621) and next prime (1242605641).

It is not a de Polignac number, because 1242605631 - 2⁷ = 1242605503 is a prime.

It is a super-2 number, since 2×1242605631² = 3088137508385816322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242605621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207100936 + ... + 207100941.

It is an arithmetic number, because the mean of its divisors is an integer number (414201878).

Almost surely, 2^1242605631 is an apocalyptic number.

1242605631 is a deficient number, since it is larger than the sum of its proper divisors (414201881).

1242605631 is an equidigital number, since it uses as much as digits as its factorization.

1242605631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414201880.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1242605631 is about 35250.6117819251. The cubic root of 1242605631 is about 1075.0890515016.

The spelling of 1242605631 in words is "one billion, two hundred forty-two million, six hundred five thousand, six hundred thirty-one".