1372561 has 4 divisors (see below), whose sum is σ = 1395124. Its totient is φ = 1350000.

The previous prime is 1372559. The next prime is 1372583. The reversal of 1372561 is 1652731.

1372561 = T₁₉ + T₂₀ + ... + T₂₀₁.

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

It can be written as a sum of positive squares in 2 ways, for example, as 801025 + 571536 = 895^2 + 756^2 .

It is a 5-Lehmer number, since φ(1372561) divides (1372561-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 1372561 - 2¹ = 1372559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1372531) 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, 11190 + ... + 11311.

It is an arithmetic number, because the mean of its divisors is an integer number (348781).

2^1372561 is an apocalyptic number.

It is an amenable number.

1372561 is a deficient number, since it is larger than the sum of its proper divisors (22563).

1372561 is an equidigital number, since it uses as much as digits as its factorization.

1372561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22562.

The product of its digits is 1260, while the sum is 25.

The square root of 1372561 is about 1171.5634852623. The cubic root of 1372561 is about 111.1332166759.

It can be divided in two parts, 13725 and 61, that multiplied together give a square (837225 = 915²).

The spelling of 1372561 in words is "one million, three hundred seventy-two thousand, five hundred sixty-one".