1572121 has 4 divisors (see below), whose sum is σ = 1580544. Its totient is φ = 1563700.

The previous prime is 1572113. The next prime is 1572149. The reversal of 1572121 is 1212751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1572121 - 2³ = 1572113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1572101) 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, 3925 + ... + 4306.

It is an arithmetic number, because the mean of its divisors is an integer number (395136).

2^1572121 is an apocalyptic number.

It is an amenable number.

1572121 is a deficient number, since it is larger than the sum of its proper divisors (8423).

1572121 is an equidigital number, since it uses as much as digits as its factorization.

1572121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8422.

The product of its digits is 140, while the sum is 19.

The square root of 1572121 is about 1253.8424940956. The cubic root of 1572121 is about 116.2774028744.

Adding to 1572121 its reverse (1212751), we get a palindrome (2784872).

It can be divided in two parts, 157 and 2121, that added together give a triangular number (2278 = T₆₇).

The spelling of 1572121 in words is "one million, five hundred seventy-two thousand, one hundred twenty-one".