1231013402 has 16 divisors (see below), whose sum is σ = 1917318600. Its totient is φ = 592065600.

The previous prime is 1231013393. The next prime is 1231013411. The reversal of 1231013402 is 2043101321.

It is an interprime number because it is at equal distance from previous prime (1231013393) and next prime (1231013411).

It can be written as a sum of positive squares in 4 ways, for example, as 681157801 + 549855601 = 26099^2 + 23449^2 .

It is a super-2 number, since 2×1231013402² = 3030787991807227208, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23849 + ... + 55052.

Almost surely, 2^1231013402 is an apocalyptic number.

1231013402 is a deficient number, since it is larger than the sum of its proper divisors (686305198).

1231013402 is a wasteful number, since it uses less digits than its factorization.

1231013402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79201.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1231013402 is about 35085.8005751615. The cubic root of 1231013402 is about 1071.7354438543.

Adding to 1231013402 its reverse (2043101321), we get a palindrome (3274114723).

The spelling of 1231013402 in words is "one billion, two hundred thirty-one million, thirteen thousand, four hundred two".