1201279651 has 24 divisors (see below), whose sum is σ = 1425502512. Its totient is φ = 1005576000.

The previous prime is 1201279631. The next prime is 1201279661. The reversal of 1201279651 is 1569721021.

It is not a de Polignac number, because 1201279651 - 2¹⁵ = 1201246883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201279631) 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, 922701 + ... + 924001.

It is an arithmetic number, because the mean of its divisors is an integer number (59395938).

Almost surely, 2^1201279651 is an apocalyptic number.

1201279651 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1201279651 is a deficient number, since it is larger than the sum of its proper divisors (224222861).

1201279651 is a wasteful number, since it uses less digits than its factorization.

1201279651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1923 (or 1912 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 1201279651 is about 34659.4814011981. The cubic root of 1201279651 is about 1063.0361661334.

The spelling of 1201279651 in words is "one billion, two hundred one million, two hundred seventy-nine thousand, six hundred fifty-one".