1220403631 has 2 divisors, whose sum is σ = 1220403632. Its totient is φ = 1220403630.

The previous prime is 1220403619. The next prime is 1220403647. The reversal of 1220403631 is 1363040221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220403631 - 2¹⁹ = 1219879343 is a prime.

It is a super-2 number, since 2×1220403631² = 2978770045115968322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220403601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610201815 + 610201816.

It is an arithmetic number, because the mean of its divisors is an integer number (610201816).

Almost surely, 2^1220403631 is an apocalyptic number.

1220403631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220403631 is an equidigital number, since it uses as much as digits as its factorization.

1220403631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 1220403631 is about 34934.2758762794. The cubic root of 1220403631 is about 1068.6475564245.

Adding to 1220403631 its reverse (1363040221), we get a palindrome (2583443852).

The spelling of 1220403631 in words is "one billion, two hundred twenty million, four hundred three thousand, six hundred thirty-one".