1231061400 has 72 divisors (see below), whose sum is σ = 4134320580. Its totient is φ = 328282560.

The previous prime is 1231061399. The next prime is 1231061411. The reversal of 1231061400 is 41601321.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 340162 + ... + 343761.

Almost surely, 2^1231061400 is an apocalyptic number.

1231061400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231061400 is an abundant number, since it is smaller than the sum of its proper divisors (2903259180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231061400 is a wasteful number, since it uses less digits than its factorization.

1231061400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683945 (or 683933 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1231061400 is about 35086.4845773982. The cubic root of 1231061400 is about 1071.7493728901.

Adding to 1231061400 its reverse (41601321), we get a palindrome (1272662721).

The spelling of 1231061400 in words is "one billion, two hundred thirty-one million, sixty-one thousand, four hundred".