1129651956 has 36 divisors (see below), whose sum is σ = 2916268992. Its totient is φ = 368538384.

The previous prime is 1129651927. The next prime is 1129652021. The reversal of 1129651956 is 6591569211.

It is a happy number.

1129651956 is a `hidden beast` number, since 1 + 129 + 6 + 519 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1129651956² = 2552227083389251872, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 332130 + ... + 335513.

It is an arithmetic number, because the mean of its divisors is an integer number (81007472).

Almost surely, 2^1129651956 is an apocalyptic number.

It is an amenable number.

1129651956 is an abundant number, since it is smaller than the sum of its proper divisors (1786617036).

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

1129651956 is a wasteful number, since it uses less digits than its factorization.

1129651956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667700 (or 667695 counting only the distinct ones).

The product of its digits is 145800, while the sum is 45.

The square root of 1129651956 is about 33610.2953869793. The cubic root of 1129651956 is about 1041.4734895051.

It can be divided in two parts, 112965 and 1956, that added together give a square (114921 = 339²).

The spelling of 1129651956 in words is "one billion, one hundred twenty-nine million, six hundred fifty-one thousand, nine hundred fifty-six".