1261159494 has 16 divisors (see below), whose sum is σ = 2882650368. Its totient is φ = 360331272.

The previous prime is 1261159489. The next prime is 1261159531. The reversal of 1261159494 is 4949511621.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 30027607 = 1261159494 / (1 + 2 + 6 + 1 + 1 + 5 + 9 + 4 + 9 + 4).

It is a congruent number.

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, 15013762 + ... + 15013845.

It is an arithmetic number, because the mean of its divisors is an integer number (180165648).

Almost surely, 2^1261159494 is an apocalyptic number.

1261159494 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1261159494 is an abundant number, since it is smaller than the sum of its proper divisors (1621490874).

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

1261159494 is a wasteful number, since it uses less digits than its factorization.

1261159494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30027619.

The product of its digits is 77760, while the sum is 42.

The square root of 1261159494 is about 35512.8074643501. The cubic root of 1261159494 is about 1080.4135059245.

The spelling of 1261159494 in words is "one billion, two hundred sixty-one million, one hundred fifty-nine thousand, four hundred ninety-four".