1561120995 has 32 divisors (see below), whose sum is σ = 2867240448. Its totient is φ = 710500608.

The previous prime is 1561120969. The next prime is 1561121017. The reversal of 1561120995 is 5990211651.

It is not a de Polignac number, because 1561120995 - 2⁸ = 1561120739 is a prime.

It is a super-2 number, since 2×1561120995² = 4874197522059580050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8914 + ... + 56583.

It is an arithmetic number, because the mean of its divisors is an integer number (89601264).

Almost surely, 2^1561120995 is an apocalyptic number.

1561120995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1561120995 is a deficient number, since it is larger than the sum of its proper divisors (1306119453).

1561120995 is a wasteful number, since it uses less digits than its factorization.

1561120995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65739.

The product of its (nonzero) digits is 24300, while the sum is 39.

The square root of 1561120995 is about 39511.0237149077. The cubic root of 1561120995 is about 1160.0557333012.

The spelling of 1561120995 in words is "one billion, five hundred sixty-one million, one hundred twenty thousand, nine hundred ninety-five".