1551990253 has 4 divisors (see below), whose sum is σ = 1693080288. Its totient is φ = 1410900220.

The previous prime is 1551990233. The next prime is 1551990259. The reversal of 1551990253 is 3520991551.

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 1551990253 - 2⁹ = 1551989741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551990259) 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, 70545001 + ... + 70545022.

It is an arithmetic number, because the mean of its divisors is an integer number (423270072).

Almost surely, 2^1551990253 is an apocalyptic number.

It is an amenable number.

1551990253 is a deficient number, since it is larger than the sum of its proper divisors (141090035).

1551990253 is a wasteful number, since it uses less digits than its factorization.

1551990253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141090034.

The product of its (nonzero) digits is 60750, while the sum is 40.

The square root of 1551990253 is about 39395.3074997518. The cubic root of 1551990253 is about 1157.7896506533.

The spelling of 1551990253 in words is "one billion, five hundred fifty-one million, nine hundred ninety thousand, two hundred fifty-three".