1231497801 has 12 divisors (see below), whose sum is σ = 1779560640. Its totient is φ = 820661400.

The previous prime is 1231497797. The next prime is 1231497811. The reversal of 1231497801 is 1087941321.

It is a happy number.

It is not a de Polignac number, because 1231497801 - 2² = 1231497797 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1231497811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3861 + ... + 49778.

It is an arithmetic number, because the mean of its divisors is an integer number (148296720).

Almost surely, 2^1231497801 is an apocalyptic number.

It is an amenable number.

1231497801 is a deficient number, since it is larger than the sum of its proper divisors (548062839).

1231497801 is a wasteful number, since it uses less digits than its factorization.

1231497801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56196 (or 56193 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 1231497801 is about 35092.7029594473. The cubic root of 1231497801 is about 1071.8760000002.

The spelling of 1231497801 in words is "one billion, two hundred thirty-one million, four hundred ninety-seven thousand, eight hundred one".