1553252261 has 16 divisors (see below), whose sum is σ = 1861194240. Its totient is φ = 1279563120.

The previous prime is 1553252219. The next prime is 1553252263. The reversal of 1553252261 is 1622523551.

It is not a de Polignac number, because 1553252261 - 2¹⁰ = 1553251237 is a prime.

It is a super-2 number, since 2×1553252261² = 4825185172603224242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1553252263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156755 + ... + 166368.

It is an arithmetic number, because the mean of its divisors is an integer number (116324640).

Almost surely, 2^1553252261 is an apocalyptic number.

1553252261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1553252261 is a deficient number, since it is larger than the sum of its proper divisors (307941979).

1553252261 is a wasteful number, since it uses less digits than its factorization.

1553252261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323176.

The product of its digits is 18000, while the sum is 32.

The square root of 1553252261 is about 39411.3214825385. The cubic root of 1553252261 is about 1158.1033862868.

The spelling of 1553252261 in words is "one billion, five hundred fifty-three million, two hundred fifty-two thousand, two hundred sixty-one".