1251423542 has 8 divisors (see below), whose sum is σ = 1877541336. Its totient is φ = 625576432.

The previous prime is 1251423541. The next prime is 1251423553. The reversal of 1251423542 is 2453241521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251423541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55688 + ... + 74859.

It is an arithmetic number, because the mean of its divisors is an integer number (234692667).

Almost surely, 2^1251423542 is an apocalyptic number.

1251423542 is a deficient number, since it is larger than the sum of its proper divisors (626117794).

1251423542 is a wasteful number, since it uses less digits than its factorization.

1251423542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135342.

The product of its digits is 9600, while the sum is 29.

The square root of 1251423542 is about 35375.4652548910. The cubic root of 1251423542 is about 1077.6261136510.

The spelling of 1251423542 in words is "one billion, two hundred fifty-one million, four hundred twenty-three thousand, five hundred forty-two".