1261456158 has 16 divisors (see below), whose sum is σ = 2523833856. Its totient is φ = 420331800.

The previous prime is 1261456129. The next prime is 1261456187. The reversal of 1261456158 is 8516541621.

It is an interprime number because it is at equal distance from previous prime (1261456129) and next prime (1261456187).

It is a super-2 number, since 2×1261456158² = 3182543277112241928, which contains 22 as substring.

It is a Curzon number.

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, 19918 + ... + 54033.

It is an arithmetic number, because the mean of its divisors is an integer number (157739616).

Almost surely, 2^1261456158 is an apocalyptic number.

1261456158 is an abundant number, since it is smaller than the sum of its proper divisors (1262377698).

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

1261456158 is a wasteful number, since it uses less digits than its factorization.

1261456158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76799.

The product of its digits is 57600, while the sum is 39.

The square root of 1261456158 is about 35516.9840780436. The cubic root of 1261456158 is about 1080.4982149205.

Adding to 1261456158 its reverse (8516541621), we get a palindrome (9777997779).

The spelling of 1261456158 in words is "one billion, two hundred sixty-one million, four hundred fifty-six thousand, one hundred fifty-eight".