1631023401 has 16 divisors (see below), whose sum is σ = 2631567744. Its totient is φ = 877188864.

The previous prime is 1631023393. The next prime is 1631023409. The reversal of 1631023401 is 1043201361.

It is an interprime number because it is at equal distance from previous prime (1631023393) and next prime (1631023409).

It is not a de Polignac number, because 1631023401 - 2³ = 1631023393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1631023409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2283990 + ... + 2284703.

It is an arithmetic number, because the mean of its divisors is an integer number (164472984).

Almost surely, 2^1631023401 is an apocalyptic number.

It is an amenable number.

1631023401 is a deficient number, since it is larger than the sum of its proper divisors (1000544343).

1631023401 is a wasteful number, since it uses less digits than its factorization.

1631023401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4568720.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1631023401 is about 40385.9307308870. The cubic root of 1631023401 is about 1177.1181713730.

Adding to 1631023401 its reverse (1043201361), we get a palindrome (2674224762).

The spelling of 1631023401 in words is "one billion, six hundred thirty-one million, twenty-three thousand, four hundred one".