1261631448 has 96 divisors (see below), whose sum is σ = 4260072960. Its totient is φ = 327695040.

The previous prime is 1261631431. The next prime is 1261631467. The reversal of 1261631448 is 8441361621.

1261631448 is a `hidden beast` number, since 1 + 2 + 616 + 31 + 4 + 4 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 108240 + ... + 119327.

It is an arithmetic number, because the mean of its divisors is an integer number (44375760).

Almost surely, 2^1261631448 is an apocalyptic number.

1261631448 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1261631448 is an abundant number, since it is smaller than the sum of its proper divisors (2998441512).

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

1261631448 is a wasteful number, since it uses less digits than its factorization.

1261631448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227597 (or 227590 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 1261631448 is about 35519.4516849571. The cubic root of 1261631448 is about 1080.5482607236.

The spelling of 1261631448 in words is "one billion, two hundred sixty-one million, six hundred thirty-one thousand, four hundred forty-eight".