1542220451 has 4 divisors (see below), whose sum is σ = 1551455472. Its totient is φ = 1532985432.

The previous prime is 1542220441. The next prime is 1542220469. The reversal of 1542220451 is 1540222451.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1542220451 - 2³⁰ = 468478627 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1542220451.

It is not an unprimeable number, because it can be changed into a prime (1542220441) 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, 4617260 + ... + 4617593.

It is an arithmetic number, because the mean of its divisors is an integer number (387863868).

Almost surely, 2^1542220451 is an apocalyptic number.

1542220451 is a deficient number, since it is larger than the sum of its proper divisors (9235021).

1542220451 is an equidigital number, since it uses as much as digits as its factorization.

1542220451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9235020.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 1542220451 is about 39271.1147155260. The cubic root of 1542220451 is about 1155.3551005494.

The spelling of 1542220451 in words is "one billion, five hundred forty-two million, two hundred twenty thousand, four hundred fifty-one".