1231400081 has 2 divisors, whose sum is σ = 1231400082. Its totient is φ = 1231400080.

The previous prime is 1231400069. The next prime is 1231400113. The reversal of 1231400081 is 1800041321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 692742400 + 538657681 = 26320^2 + 23209^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231400081 - 2¹⁴ = 1231383697 is a prime.

It is a super-2 number, since 2×1231400081² = 3032692318973613122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1231400021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615700040 + 615700041.

It is an arithmetic number, because the mean of its divisors is an integer number (615700041).

Almost surely, 2^1231400081 is an apocalyptic number.

It is an amenable number.

1231400081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231400081 is an equidigital number, since it uses as much as digits as its factorization.

1231400081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 1231400081 is about 35091.3106195822. The cubic root of 1231400081 is about 1071.8476479416.

The spelling of 1231400081 in words is "one billion, two hundred thirty-one million, four hundred thousand, eighty-one".