1261158357 has 16 divisors (see below), whose sum is σ = 1747811520. Its totient is φ = 808186752.

The previous prime is 1261158331. The next prime is 1261158359. The reversal of 1261158357 is 7538511621.

It is not a de Polignac number, because 1261158357 - 2⁷ = 1261158229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261158359) 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, 59232 + ... + 77657.

It is an arithmetic number, because the mean of its divisors is an integer number (109238220).

Almost surely, 2^1261158357 is an apocalyptic number.

It is an amenable number.

1261158357 is a deficient number, since it is larger than the sum of its proper divisors (486653163).

1261158357 is a wasteful number, since it uses less digits than its factorization.

1261158357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137012.

The product of its digits is 50400, while the sum is 39.

The square root of 1261158357 is about 35512.7914560374. The cubic root of 1261158357 is about 1080.4131812416.

Adding to 1261158357 its reverse (7538511621), we get a palindrome (8799669978).

The spelling of 1261158357 in words is "one billion, two hundred sixty-one million, one hundred fifty-eight thousand, three hundred fifty-seven".