1161621545 has 16 divisors (see below), whose sum is σ = 1616861568. Its totient is φ = 784650240.

The previous prime is 1161621533. The next prime is 1161621547. The reversal of 1161621545 is 5451261611.

It is not a de Polignac number, because 1161621545 - 2⁴ = 1161621529 is a prime.

It is a super-2 number, since 2×1161621545² = 2698729227616374050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1161621547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245336 + ... + 250025.

It is an arithmetic number, because the mean of its divisors is an integer number (101053848).

Almost surely, 2^1161621545 is an apocalyptic number.

It is an amenable number.

1161621545 is a deficient number, since it is larger than the sum of its proper divisors (455240023).

1161621545 is an equidigital number, since it uses as much as digits as its factorization.

1161621545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495440.

The product of its digits is 7200, while the sum is 32.

The square root of 1161621545 is about 34082.5695187437. The cubic root of 1161621545 is about 1051.2069401731.

The spelling of 1161621545 in words is "one billion, one hundred sixty-one million, six hundred twenty-one thousand, five hundred forty-five".