1131661445 has 16 divisors (see below), whose sum is σ = 1367224320. Its totient is φ = 899195904.

The previous prime is 1131661409. The next prime is 1131661501. The reversal of 1131661445 is 5441661311.

It is a cyclic number.

It is not a de Polignac number, because 1131661445 - 2²⁴ = 1114884229 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 642476 + ... + 644234.

It is an arithmetic number, because the mean of its divisors is an integer number (85451520).

Almost surely, 2^1131661445 is an apocalyptic number.

It is an amenable number.

1131661445 is a deficient number, since it is larger than the sum of its proper divisors (235562875).

1131661445 is a wasteful number, since it uses less digits than its factorization.

1131661445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2564.

The product of its digits is 8640, while the sum is 32.

The square root of 1131661445 is about 33640.1760548306. The cubic root of 1131661445 is about 1042.0906677392.

The spelling of 1131661445 in words is "one billion, one hundred thirty-one million, six hundred sixty-one thousand, four hundred forty-five".