1261990467 has 24 divisors (see below), whose sum is σ = 1880913216. Its totient is φ = 814910976.

The previous prime is 1261990459. The next prime is 1261990481. The reversal of 1261990467 is 7640991621.

It is not a de Polignac number, because 1261990467 - 2³ = 1261990459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1261990447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25653 + ... + 56409.

It is an arithmetic number, because the mean of its divisors is an integer number (78371384).

Almost surely, 2^1261990467 is an apocalyptic number.

1261990467 is a deficient number, since it is larger than the sum of its proper divisors (618922749).

1261990467 is a wasteful number, since it uses less digits than its factorization.

1261990467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30907 (or 30904 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 1261990467 is about 35524.5051619301. The cubic root of 1261990467 is about 1080.6507472209.

The spelling of 1261990467 in words is "one billion, two hundred sixty-one million, nine hundred ninety thousand, four hundred sixty-seven".