1261145570 has 16 divisors (see below), whose sum is σ = 2272034880. Its totient is φ = 504019824.

The previous prime is 1261145551. The next prime is 1261145593. The reversal of 1261145570 is 755411621.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42590 + ... + 65849.

It is an arithmetic number, because the mean of its divisors is an integer number (142002180).

Almost surely, 2^1261145570 is an apocalyptic number.

1261145570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1261145570 is a deficient number, since it is larger than the sum of its proper divisors (1010889310).

1261145570 is a wasteful number, since it uses less digits than its factorization.

1261145570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109609.

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 1261145570 is about 35512.6114218597. The cubic root of 1261145570 is about 1080.4095297599.

The spelling of 1261145570 in words is "one billion, two hundred sixty-one million, one hundred forty-five thousand, five hundred seventy".