1252023561 has 40 divisors (see below), whose sum is σ = 1997138880. Its totient is φ = 779774688.

The previous prime is 1252023557. The next prime is 1252023581. The reversal of 1252023561 is 1653202521.

It is a happy number.

It is not a de Polignac number, because 1252023561 - 2² = 1252023557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1252023541) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 72295 + ... + 87923.

It is an arithmetic number, because the mean of its divisors is an integer number (49928472).

Almost surely, 2^1252023561 is an apocalyptic number.

It is an amenable number.

1252023561 is a deficient number, since it is larger than the sum of its proper divisors (745115319).

1252023561 is a wasteful number, since it uses less digits than its factorization.

1252023561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15707 (or 15698 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 1252023561 is about 35383.9449609565. The cubic root of 1252023561 is about 1077.7983156295.

The spelling of 1252023561 in words is "one billion, two hundred fifty-two million, twenty-three thousand, five hundred sixty-one".